The seismic response analysis of subway station in different artificial boundary conditions

The seismic analysis of underground structures is relatively complex, and there is no unified point of view. In this paper, we analysis the dynamic response characteristics of the Dakai subway station by the horizontal seismic loads in ANSYS, and take into account the three artificial boundary conditions: fixed boundary, viscous boundary and visco-elastic boundary. The results show that the stress and displacement response under fixed boundary is the maximum, the results of visco-elastic boundary are smaller. That suggests the visco-elastic boundary is more accurately to simulate the actual force performance of artificial boundary. In addition, the stress at the top and bottom of middle column is the maximum in the stress calculation of subway station structural, where will be more likely to lead shear-related damage. So that it has a good reference value in the design and construction of actual project.